Services like MusicBrainz and SoundHound can detect a recorded song's acoustic fingerprint and match it with an existing song. This lets them identify the title and artist of an unnamed recorded musical extract. In this comic, Megan hacks the acoustic fingerprint database to add her own entry with a message to Cueball, in which she asks him to buy cat food.

HTTP error code 406 means Not Acceptable. When a client requests data from a server, the client lists the data formats that it can accept. If a server is unable to provide data in any format that the client accepts, the server returns error 406 Not Acceptable. For example, this can occur if a client requests XML but the server supports only JSON. In the comic, the standard meaning of the error message is ignored and the text "Not Acceptable" is taken literally: The server is offended by Randall's humming.